Yeh, I run across tough ones too at times and it doesn't seem related to the treatment the carcase gets which the same each time. I once thought it might be adrenaline from being chased prior to shooting but have ruled that out. The vast majority of mine are oblivious prior to copping a bullet. Even ones in top condition can be less than tender at times.
Speaking of condition, here's a large-bodied sika stag we scored on the weekend. There were litres of fat globules in its gut
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